Yellow monoazo dye and process of making same.



UNITED STATES PATENT OFFICE.

AUGUST LEOPOLD LASKA, OF OFFENBACH-ON-THE-MAIN, GERMANY, AS- SIGN OR TO CHEMTSOHE FABRIK GRIESHEIM-ELEKTRON, OF FRANK- FORT-ONTHE MAIN, GERMANY, A CORPORATION.

YELLOW MONOAZO DYE AND PROCESS'OF MAKING SAME.

Specification of Letters Patent.

Patented April 9, 1907.

To all, whom it may concern:

Be it known that I, AUGUST LEOPOLD LAsKA, doctor of philosophy, chemist, and a resident of 5 Gerberstrasse, Offenbach-onthe-Main, in the Grand Duchy of Hesse,

Germany, have invented new and useful Im- OOOH G N CH2 N.OnHi.X, CO

wherein X means a hydro en atom or a su fo group. The dyestuffs thus obtained dye wool yellow tints of excellent fastness to light.

The following example will serve to illustrate my invention. The parts are by weight.

Example: 48.4 arts of 3:4 dichloranilinsulfonic acid ((11.0 .NH .SO,H 1 :21415) and 11.3 arts of calcined sodium carbonate are disso ved in one hundred and fifty parts -of water. The solution is cooled down to 15 centigrade by addition of ice and diazotized by means of fifty-seven parts of hydrochloric acid 20 Baum and 13.8 parts of sodium nitrite. The diazo solution is then poured into an ice-cold solution of 56.8 parts of 1- para sulfophenyl 5 yrazolon 3 -carbonic acid in about five hum red parts of water and .the sufficient quantity of sodium carbonate.

After the formation of the (lycstufl' is completed the mixture is heated up to centigrade and the dyestu'li' precipitated by acidifying and addition of common salt, filtered, pressed, and dried in the usual manner. The

combinations with other diazo compounds' and with the 1-phenyl5pyrazolon-3-carbonic acid may be carried out in the same manner.

The tollowin table will give some of the properties of t e azo ooloring-matters obtamed according to my invention:

They also are'very apt for the production of pigment colon.

Dyestufl prepared by Dyes wool combination of diazo: With- I from acidtlZBtl-- batl1 P. Cliloranilin-orthosu'l- Sulioghenylpyrazolon- Lemon yelionlc acid car onic acid low.

Chloranilin ortho s u l Phonylpyrazolon car- Yellow.

ionic acid bonic acid Cliloranilinsulionic acid Sulfoghenylpyrazolon- Yellow.

(131 NH: S0211 car onic acid Chlornnillnsulionic acid Phenylpyrnzolon enr- Yellow.

Cl Nh 80 K bonic acid 1 4 Diehlorauilin s u 11 0 ni c Suljo henylpfmzolon- Yellow. acid Cl Jl Nih SO I-l car onlc ac (I L 5 Dichloranllin s ulf o n i c Phenylpymzolon car- Rcddish yelacid (12'. Cl N141} SO H bonic acid low.

The color-lakes obtained from these dyestuffs are of excellent fastness to light and water.

Now what I claim, and desire to secure by Letters Patent, is the'following:

1. The )rocess of manufacturing yellow monoazo yestufis, which consists in combining the diazotized chlorin derivatives of the orthoanilinsulfonic acid with'pyrazolon derivatives of the general formula:

COOHC H ON C PLX, wherein X means a hydrogen atom or a sulfo group. I

2. As a new articleof manufacture the dyestuffs obtained by combining the ;diazo tized chlorin derivatives of the orthoaniliu' snlfonic acid with pyrazolon derivatives of the general formula: I

COoHfl H ONpC lLX, whercin'X means a hydrogen atom or a sulfo group, forming orange-powders, soluble in concentrated sulfuric acid to an orange solu tion, in water to a yellow one, being hardly altered by addition of caustic-soda lye or hydrochloric acid.

In testimony that I clanh the foregoing as my invention I have signed my name, in 

